fix(subs): disable save/kwargs mutation + better LOG_LEVEL

[michael-0acf4]

Tackles MET-724 and MET-730 .

• A reference to run.kwargs should not be exposed directly, the kwargs used by the user should be a deep copy.
• save now returns a deep copy of the returned value
• noisy debug logs on substantial agent (disabled by default)

Migration notes

save will always refer to a deep clone of a value throughout the initial run/replay.

const example = await ctx.save(() => someRef);
someRef.field = "changed!"; // will not affect example

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 34 lines in your changes missing coverage. Please review.

Project coverage is 77.68%. Comparing base (7681e24) to head (bc46017).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/typegate/src/runtimes/substantial/agent.ts	60.93%	25 Missing ⚠️
src/typegate/src/log.ts	71.42%	8 Missing ⚠️
tests/runtimes/substantial/common.ts	98.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
+ Coverage   77.58%   77.68%   +0.10%     
==========================================
  Files         149      149              
  Lines       18385    18486     +101     
  Branches     1788     1793       +5     
==========================================
+ Hits        14264    14361      +97     
- Misses       4098     4102       +4     
  Partials       23       23              

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[michael-0acf4]

published_test.ts seems to inherit the current env variables...